tests: require Python 3.5+ in run-tests.py...
tests: require Python 3.5+ in run-tests.py
We change the version check logic to hard fail if running on
<= 3.5.0. The branch for <3.5 has been deleted. And the >=3.5
branch block has been dedented.
Differential Revision:
https://phab.mercurial-scm.org/D12234